tree 8257a7a01467b60c0a28ada2d8e9a85a26342b69
parent 015524b5fab7cf2c4fb6640181a1fcf30d199c51
author Xianzhu Wang <wangxianzhu@chromium.org> 1645847719 -0800
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1645848403 -0800

Ensure backdrop filter cc::Layers are marked as drawing content

ContentLayerClientImpl::UpdateCcPictureLayer needs to set
cc::Layer::DrawsContent to true for content under a backdrop filter.
The previous code would do this based on the PendingLayer's effect node,
but this is incorrect if a single object has both a backdrop filter
effect node and a filter effect node. This approach failed to re-run
UpdateCcPictureLayer when HasBackdropEffect changed (see new WPT test
repaint-added-backdrop-filter.html).

This patch forces draws-content of all PendingLayers under an effect
node needing draws-content.

This patch is based on pdr@'s crrev.com/c/3367277. That patch uses
ScopedForceDrawsContent during painting and forces draws content flag
of PaintChunks. The problem is that we need to repaint the subtree of
an effect node on change of the node's MayDrawContent() status.

Bug: 1273849
Change-Id: Ie49d40c37767265e45278cf89ddf032895b9e832
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3474495
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#975407}